Blue dyestuff.



- UNITED STATES HUGO SCHWEITZER AND ARTHUR ZART,

Edi;

0F ELBERFELD, GERMANY, ASSIGNOBS TO FARBENFABRIKEN VORM. FRIEDR. BAYER & 00., OF ELBERCEELD, GERMANY, A

CORPORATION OF GERMANY.

BLUE DYES'IUFF.

No Drawing.

To all whom it may concern.

Be it known that we, HUGO Scnwnrrzan and ARTHUR ZART, doctors of philosophy, chemists, citizens of the German Empire, residing at Elberfeld, Germany, have invented new and useful Improvements in Blue Dyestufi's, of which the following is a specification.

In United States Letters Patents 1,038,209 and 1,038,210 the manufacture and production is described of new azo dyestuffs which after dyeing or printing can be combined on the fiber with diazotized nitranilins, producing shades varying generally from red to violet to blue. The process for the production of these new azo dyestutl's consists in combiningeiihcr one molecule or two molecules of the same or of different diazoazo compounds free from aminoand hyuroxy groups with one molecule of 2.2-d1naphthylamin-5.5-dioxy-7.7'-disulfonic acid of the formula:

I ll On dyeing, or printing these dyes on cot ton and combinlug them on the fiber with Speciilcation of Letters Patent.

Application filed June 3, 1913. Serial No. 771,533.

Patented Mar. 3, 1914.

azo tized aminoazo compound free from ammo and hydroxy groups and one molecule of 2 .2-dinaphthylamin-5.5'-dio -7.7-disultonic acid with one molecule 0 diazotized 2.5.7- or 2.8.(3-aminonaphthol s'ulfonic acid or with one molecule of diazotized l-chloro- 2.5.7- or 1 chloro-2. 8.6-aminonaphthol sulfonic acid. The new dyes having most probably the formula:

/SOIH R meaning an azo compound being free from an oxy and amino group; It meaning a substituted alpha-naphthol radical. such as the radical of a naphthol sulfonic acid. and chloronaphthol suljt'ouie acid.

The new dies are after being dried and pulverized in the shape of their alkaline salts dark powders soluble in water with a violet to blue coloration; yielding upon reduction with stannous chlorid and hydrochloric acid a substituted amino-naphthol derivative. an amin, a diainin and 5.5'-- dioxy dinaphthylamin 6.6 diamin- T.7'-disuli'ouic acid. They dye cotton in blue shades which on being developed with diazotized para-nitranilin change into navyblue shades fast to unshing and to light.

In order to illustrate the new process more fully the following example is given, the parts being by weight:l32 parts of the axuinoazo eompouud: para-nitrobenzeneortho sulfonie acid azo l naphthyla1nin-7-sul'fonic acid are diazotized with bydrochloric acid and sodium nitrite and acid. The mixture is stirred for 6 hours until the combination is finished and the is in the shape of its sodium salt a dark powder which is easily soluble in water with a reddish-blue coloration and which is soluble in concentrated sulfuric acid with a green ish-blue coloration. Upon reduction with stannous! chlorid and hydrochloric acid it is split up, into 6.6-diamino-5.5-dioXy-2- dinaphthylamin-7.7-disulfonic acid, 2-ami.- no-fi-naphthol-Y-sulfonic acid, para-phenyh enediamin sulfonic acid and lfll-naphtliyl enediamin-T-sulfonic acid. It dyes cotton l blue; I

The dyeing with this color may be carried out in the following way: A dye bath is prepared containing in 1000 parts of water, 4parts ofthe above described dyestufi', 2 parts ofcalcin'edsodium carbonate and 30 parts of .Glauber salt. 100 parts of cotton a'reentered, the bath is heated to boiling in the course of half an hour and the boiling is continued for half an hour. The goods which are dyed blue are then treated with diazotized para-nitranilin, exposed to air and rinsed, A deep navy-blue fast to wash ing is thus obtained which can be discharged to a pure White with hydrosulfites. The cotton can also be padded or printed with these dyestufis and can then be combined on the' fiber with, diazotized nitranilins.

The process for the manufacture of the dyestuffs iscarried .out in an analogous manner if other components are used for the production of the aminoazo compounds of the'above mentioned character 2'. 6. he- 1 oser/es diazo compound obtained from 239 parts of 2.5.7-aminonaphthol-sulfonic acid is then added to it. is salted out, filtered 0d and dried. The new dye having most probably the formula ing tree from OH or additional NH groups.

For instance the para-nitranilin-ortho-sultonic acid being a component of the amino am dye of the example may be replaced by chloroanilinsulfonic acids, chloro-toluidin- 1 sulfonic ,acids, Xylidin-sulfonic acids, naphthylainin sulfonic acids, etc., and thel-naphtliylamin-Y-sulfonic acid being the'second component of.the aminoazo dye of the example may be replaced by para-xylidin, cresidin, alphanaphthylamin, etc.

We claim 1. The herein described new azo dyestuffs having most probably the formula:

R meaning an azo compound being free from an oxy and amino group; R meaning a substituted alpha-naphthol radical, which are after being dried and pulverized in the shape of their alkaline salts dark powders soluble in water with a violet to blue coloration; yielding upon reduction wi h stannous chlorid and hydrochloric acid a substitutedaminonaphthol derivative, an amin, a diamin and 5.5'-dioxy-2.2-dinaphthylamin-6.6'-diamin-7.'Z-disulfonic acid; dye ing cotton blue shades which on being developed with diazctized para-nitranilin It is heated to 75? (3., the dye I ainin-Tsulfonic acid; dyeing cotton blue,

2. The herein described new dye having change into blue shades fast to washing and in a free state most probably the formula:

to light, substantially as described.

saw/Uniting) VY E H I /S0H which shade after being develo ed with diazotized para-nitranilin is navylue fast to washing which can be discharged to a pure white, substantially as described.

In testimony whereof we have hereunto set our hands in the presence of two subscribing witnesses.

HUGO SCHWEITZER. [1 s.-] ARTHUR ZART. [L.B.]

Witnesses ALBERT NUFER, PAUL KAUFMANN.

which is after being dried and pulverized in the shape of its sodium salt a dark powder which is easily soluble in water with a reddish-blue coloration and which is soluble in concentrated sulfuric acid with a greenish-blue colorati0n;-yie1ding upon reduction with stannous chlorid and hydrochloric acid 6.6-diamino-5.5-dioxy-2.2'-dinaphthylamin-7.7-disulfonic acid, Q-amino- 5-naphtho1-7-sulfonic acid, para-phenylenediamin-sulfonic acid and l.4=-naphthylenedi= Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

